100% working fix for weather app crashing
Step 1: Download and install iFile from Cydia.
Step 2: Download the package "iOS App Weather 6.x Fix.deb" for your device by visiting the following URL:
http://cl.ly/313v292X1C2T (copy/paste the link in Safari of your iOS device)
Step 3: After the download is complete, it will load a new screen (in Safari) where you will be prompted to open the file you just downloaded with a program of your choice. Select iFile option in the upper right corner.
Step 4: At this point iFile will be launched on your iPhone, iPod touch or iPad and it will automatically open the options page for the file in question. Select "Installer" and wait a few moments, on completion of installation process tap Done that will appear in the upper right corner.